1.

What vector must be added to the two vectors \[\hat{i}-2\hat{j}+2\hat{k}\] and \[2\hat{i}+\hat{j}-\hat{k},\] so that the resultant may be a unit vector along     x-axis  [BHU 1990]

A.        \[2\hat{i}+\hat{j}-\hat{k}\]        
B.        \[-2\hat{i}+\hat{j}-\hat{k}\]
C.        \[2\hat{i}-\hat{j}+\hat{k}\]
D. \[-2\hat{i}-\hat{j}-\hat{k}\]
Answer» C.        \[2\hat{i}-\hat{j}+\hat{k}\]


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